External links
Framework for developing Games in Crystal
A BitTorrent library in pure Crystal
JSON-RPC client and server library
Papierkorb's "cute" (event-centric publish/subscribe model) with additions
A simple Crystal UI framework for terminal interfaces.
UI framework based on the Fusion/libui.cr library, with elements from watzon/cru.
Readline-esque library with fancy features
The fancyline fork for LoveShell
LibUI based GUI framework for Crystal